match problem by rownames
As suggested in ?"[.data.frame", try:
dat[match('a1', rownames(dat)),]
Haris Skiadas
Department of Mathematics and Computer Science
Hanover College
On Sep 9, 2008, at 2:41 AM, Xianming Wei wrote:
Hi all, While dat['a1',] and dat['a10',] produce the same results in the following example, I'd like dat['a1',] to return NAs. dat <- data.frame(x1 = paste(letters[1:5],10, sep=''), x2=rnorm(5)) rownames(dat) <- dat$x1 dat['a1',] dat['a10',]
sessionInfo()
R version 2.7.2 (2008-08-25) i386-pc-mingw32 locale: LC_COLLATE=English_Australia.1252;LC_CTYPE=English_Australia. 1252;LC_MON ETARY=English_Australia.1252;LC_NUMERIC=C;LC_TIME=English_Australia. 1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] lattice_0.17-13 loaded via a namespace (and not attached): [1] grid_2.7.2
Regards, Xianming